Hydrogen forms an hcp solid at low temperatures, melting at - 259.2 C and boiling at - 252.7 C. The atomic configuration of the atom is (1s) 1, and it has an ionic radius of 0.208 nm. Three isotopes ...
The electronic configuration of magnesium is (Ne)(3s) 2, and the atomic radius is 0.16 nm. Magnesium has an hcp lattice with a = 0.321nm and c = 0.521 nm. The diagram shows a schematic unit cell.
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